(after @aalexander3/oo-many-many-practice)

• Member
• Institution
• Membership

• A membership belongs_to a member
• A membership belongs_to a institution
• A member has_many memberships
• An institution has_many memberships
• A member has_many many institutions through memberships
• An institution has_many members through memberships

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• Draw this domain on a whiteboard or http://awwapp.com/
• Build out the three classes and files from scratch (keep in mind the relationships)
• Think about how the classes will interact -- how does a doctor know about their patients?
• Use attr_reader, attr_writer, & attr_accessor
• Create a run file with a single point of entry
• Maintain single source of truth for all classes

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• INSTITUTION
  • #initialize an institution is initialized with a name and a kind (e.g., gym, salon, etc.)
  • an institution cannot change its name, but can change its kind
  • Institution.all returns all instances of the institution class
  • #memberships returns an array of all the membership instances that belong_to an institution
  • #members return an array of all the members that are associated with an institution
  • #member names return an array of just the names of said members (First and Last), not the full object ====== BONUS ======
  • Institution.find_by_kind takes in a kind (e.g., "gym") as an argument and finds an institution by a given kind
  • #upgrade_membership takes in a membership and a new tier ("free" => "premium") and changes the membership's tier

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• MEMBER
  • #initialize a member is initialized with a first_name and last_name
  • a member cannot change their name
  • Member.all returns all instances of the member class
  • #member_name converts a member's first and last name to member_name (e.g., "John Smith => "jsmith")
  • #memberships returns an array of all the memberships associated with an instance of member
  • #buy_membership creates a new membership instance taking in an institution and a tier (e.g., free", "premium") ====== BONUS ======
  • Member.find_by_name takes in member_name (e.g., "jsmith", not "John Smith") as an argument and finds a member's full name by a member_name
  • #find_institution finds an institution by kind (e.g., "gym", "salon") -- utilizing the Institution.find_by_kind class method

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• MEMBERSHIP
  • #initialize a membership is initialized with a tier ("free", "premium", etc.), a member and an institution
  • an membership has corresponding methods for all three attributes
  • Membership.all returns all instances of the membership class

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